How does rising atmospheric CO2 affect marine organisms?

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Ashdod Coast, Eastern Mediterranean
Schilman, B., Ayalon, A., Bar-Matthews, M., Kagan, E.J. and Almogi-Labin, A. 2002. Sea-land paleoclimate correlation in the Eastern Mediterranean region during the late Holocene. Israel Journal of Earth Sciences 51: 181-190.

The authors analyzed high-resolution δ18O values from a speleothem in Soreq Cave, central Israel (3145'N, 3503'E), as well as from planktonic foraminifera in two marine sediment cores retrieved just off the Ashdod coast (3156.41'N, 3422.13'E and 3156.61'N, 3419.79'E), to obtain a 3600-year record of past climate in this region. A humid event between AD 1100 and 1400 that peaked at AD 1300, was described by them as "coinciding with the known global Medieval Warm Period."